Syringomyelia is usually asymptomatic, so most patients present to the clinic with a swelling in the scrotum discovered during a physical examination or bath. Only if there is an unusually large amount of fluid in the sphincter cavity will there be mild pulling pain and a sensation of downward movement. If the lump formed by the sphincter is very large, it tends to invaginate the penis, thus interfering with urination and sexual life. Moreover, the lump formed by a syringomyelia does not usually change significantly in size. In the case of secondary syringomyelia, there may also be manifestations of corresponding primary diseases, such as inflammation, tumours and trauma, which may lead to syringomyelia.